Does anyone have any advice on which kind of water pumps suit well with Arduino? I have a Arduino connected to a relay and from there to some kind of water pump. Some require transformers for example, which one is the best?

Terry has designed broadcast stations, recording studios, broadcast equipment, intelligent machines and special computer languages for IBM, and has worked as a broadcast journalist covering elections, fires, riots and Woodstock.
He has taught electronics

Hello,Does anyone have any advice on which kind of water pumps suit well with Arduino?

All type of water pumps that are driven electrically suit Arduino.. You need relay or MOSFETs to drive depends upon the load requirement by the pump..Do you know Arduino has also a pump in its core? guess what?